This type of question occurs frequently and there are numerous threads with large discussions on this topic, but it boils down to a few salient points:

1. As far as I'm aware, no one on here is a lawyer, and therefore cannot give adequate legal advise.

2. If you decide to use graphics that are not your own, then YOU must take responsibility for that action, and any subsequent litigation that could occur because of your actions is then entirely on your shoulders.

3. Any answer you get here will generally be purely speculative and mostly subjective.

4. It will ALWAYS be more preferable to create or 'buy-in' any graphics that you intend to use, especially in a commercial venture.

In summary, the choice is yours.

If your vision so exceeds your ability, then look to something closer.

It's copyrighted so no, you can't use it for anything you release. You could always try to send Playmore a mail asking for permission, but it's ripped from a commercial game so I doubt they'll let you.

Just so it's said; you should *always* ask permission to use stuff that isn't yours. Unless the creator states explicitly that people can use it freely.

i think you can use it but you have to mention that to him , this case only work if he didn't answered you. and i think he has the permission to take them off if he found that but you can replace them in anytime!! hope someone post some links help us on these stuffs :P

hmmm i really don't know , if i ever found this i just would put their names on credit and if they need some of the money that i got from it ill give some like 30% this if i can't contact them! am i right about this??